Furnace.



PATENTED JULY 2, .1907.

H. A. PARRLSH.

FURNACE. APPLICATION FILED NOV.15, 1904.

1n: uanms PETERYCOH WASHINGTON, u. c

HOMER A.'PARRISII, OF JACKSON, MICHIGAN.

FURNACE Specification of Letters Patent.

Patented July 2, 1907.

Application filed November 15, 1904. Serial No- 232,820-

To all whom it may concern:

Be it known that I, HOMER A. PARRISH, residing at Jackson, in the countyof Jackson and State of Michigan, a citizen of the United States, haveinvented certain new and useful Improvements in Furnaces, of which thefollowing is a specification, reference being had therein to theaccompanying drawings.

The invention relates to new and useful improvements in heating furnacesand consists particularly in The invention further consists in theconstruction I arrangement and combination of the various parts, as morefully hereinafter set forth and particularly pointed out in the claims.

In the drawings, Figure l is a vertical central section through a simpleform of hot air furnace, showing my invention applied thereto andshowing two ways of supplying air to the lower part of the supplementalheating chamber. Fig. 2 is an enlarged section through the outer shellof the furnace heating chamber, the shell of the supplemental chamberand a supporting ring.

I have shown my invention applied to a very simple form of hot airfurnace. The construction of the fiu'nace itself is no part of myinvention, as it may be applied to most any type of furnace intended foruse in heating houses or other buildings. I will describe, in a briefway, the furnace herein shown.

A represents the fire pot, B the grate, O a shell by which is formed acombustion chamber D above the grate and an ash pit section E below thegrate. From this combustion chamber leads the usual smoke pipe F. Aroundthe shell 0 and spaced therefrom, is the usual shell G, forming betweenthe shell 0 and the shell G the main air heating chamber H, such as isordinarily used in hot fiunaces.

I is theinlet pipe for the air to be heated, connecting with the chamberH at or near the lower end thereof.

J are the usual hot air pipes communicating with the chamber H andleading up into the house at any desired point. t

In the construction of such furnaces, particularly hot air furnaces, agreat deal of heat is radiated into the cellanand, so far as heating thehouse is concerned, this heat is wasted. "I desire to utilize this heat,i. e. convey it to the house, and to this end I place a shell K outsideand inclosing the upper portion of the furnace, spaced from the wall G asufiicient distance to form within it a supplemental air heating chamberL,

the air in which will be heated by the radiation from the wall G. Inthis particular construction, I have shown a flanged ring a, between theupper and the lower parts of the shell G, as is usual in furnaceconstruction, and I have shown a flanged extension b on this ring, as asimple and convenient means of supporting the shell K at its lower edge.

Leading off from the supplemental air heating chamber L is the hot airpipe M. This is preferably taken off from the top of the shell K andthere may be one or more, as desired, according to the wishes of the person constructing the furnace and the arrangement of the furnace inrelation to the rooms of the house. I have shown the shell K coveredwith an asbestos sheathing N to better retain the heat therein.

In order to get an air circulation from the chamber L out through thepipe M, I provide ports or openings 0 in the wall G at the lower part ofthe supplemental chamber L, and a branch pipe P leading from the pipe Mto the lower end of said chamber. The passage of air through the branchpipe P is controlled by a damper or valve arranged within said pipe andby closing this damper or valve the supply of air to the chamber L ismade to depend upon the ports or openings O, the air first entering themain air heating chamber H and passing from thence, through said portsor openings. By opening the damper or valve arranged in the branch pipeP air is supplied to the supplemental heating chamber directly from thepipe M.

I have shown the supplemental air heating chamber as extending down toat or near the top of the fire pot. The particular extent of this airheating chamber is somewhat immaterial and may be arranged to suit theconvenience of the furnace to which it is applied or the desire of themanufacturer. It is desirable, however, that this supplemental chambershall inclose the top and preferably part of the sides of the furnaceproper and I think the best results are obtained by extending thisinclosure down to the point indicated in the drawings.

The parts being thus constructed, their operation is as follows:The firebeing built in the fire pot in the usual manner, the smoke passes outthrough-the pipe F and the air in the chamber H being heated, will risethrough the pipes J to be distributed to the house in the usual manner,fresh air being continually supplied through the pipe I. The air in thechamber L willbe heated by the radiation from the wall G and it willflow into the house through the pipe M, fresh air being supplied eitherthrough the ports 0 or through the pipe P, or by any other suitable airsupply connection.

This device can be applied to new furnaces or to old furnaces already inuse and may be used in connection with hot air furnaces or other typesof furnaces What I claim as my invention is:-

1. In a hot air furnace the combination of a combustion chamber, a mainair heating chamber having an air exit and an air inlet, a main airsupply conduit for the main air heating chamber communicating at thebase thereof, a supplemental air heating chamber arranged around theupper part of the main air heating chamber and having an air exit and anair inlet and a branch air supply conduit communicating with the mainair supply conduit outside the furnace and the supplemental air heatingchamber at the base thereof.

2. In a hot air furnace the combination of a combus tion chamber, a mainair heating chamber having an air exit and an air inlet, a main airsupply conduit for the main air heating chamber communicating at thebase thereof, a supplemental air heating chamber arranged around theupper part of the main air heating chamber and having an air exit and anair inlet and a valve controlled branch conduit communicating betweenthe main air supply conduit outside the furnace and the supplemental airheating chamber at the base thereof.

3. In a hot air furnace the combination of a combustion chamber, a mainair heating chamber having an air exit and an air inlet, a main airsupply conduit for the main air heating chamber communicating at thebase thereof, a supplemental air heating chamber arranged around theupper part of the main air heating chamber and having an air exit and anair inlet and communicating at its base with the main air heatingchamber and a valve controlled branch air supply conduit for the supple-I mental air heating chamber communicating with the main air supplyconduit outside of the furnace and the supplemental air heating chamberat the base thereof.

4. The combination in a hot air furnace of a fire pot, a shell inclosingthe fire pot and extending above the same to form a combustion chamber,a second shell entirely incolsing the first mentioned shell to form amain air heating chamber, said second shell being provided at its topwith air exit openings, and openings arranged at a height directly abovethe top of the fire pot and an air inlet opening at its base, a thirdshell to form a supplemental air heating chamber inclosing the upperpart of the second shell and terminating at a point directly above theheight of the fire pot, said shell being provided with an air exitopening at its top and an air inlet opening at its base, a main airsupply conduit communicating with the air inlet opening at the base ofthe second shell; and a valve controlled air supply conduitcommunicating with the air inlet opening in the third shell and the mainair supply conduit.

5. In a hot air furnace, the combination with a combustion chamber and amain air heating chamber having an air exit and an air inlet of asupplemental air heating chamber having an air exit and an air inlet andcommunicating at its base only with the main air heating chamber.

In testimony whereof I affix my signature in presence of two witnesses.

HOMER A. PARRISH.

Witnesses:

VERNE W. BADGLEY, Crms. A. Panmsn.

